ftpd.c revision 1.26
1/* $OpenBSD: ftpd.c,v 1.26 1996/12/07 09:00:22 bitblt Exp $ */ 2/* $NetBSD: ftpd.c,v 1.15 1995/06/03 22:46:47 mycroft Exp $ */ 3 4/* 5 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37#ifndef lint 38static char copyright[] = 39"@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41#endif /* not lint */ 42 43#ifndef lint 44#if 0 45static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 46#else 47static char rcsid[] = "$NetBSD: ftpd.c,v 1.15 1995/06/03 22:46:47 mycroft Exp $"; 48#endif 49#endif /* not lint */ 50 51/* 52 * FTP server. 53 */ 54#include <sys/param.h> 55#include <sys/stat.h> 56#include <sys/ioctl.h> 57#include <sys/socket.h> 58#include <sys/wait.h> 59#include <sys/mman.h> 60 61#include <netinet/in.h> 62#include <netinet/in_systm.h> 63#include <netinet/ip.h> 64#include <netinet/tcp.h> 65 66#define FTP_NAMES 67#include <arpa/ftp.h> 68#include <arpa/inet.h> 69#include <arpa/telnet.h> 70 71#include <ctype.h> 72#include <dirent.h> 73#include <err.h> 74#include <errno.h> 75#include <fcntl.h> 76#include <glob.h> 77#include <limits.h> 78#include <netdb.h> 79#include <pwd.h> 80#include <setjmp.h> 81#include <signal.h> 82#include <stdio.h> 83#include <stdlib.h> 84#include <string.h> 85#include <syslog.h> 86#include <time.h> 87#include <vis.h> 88#include <unistd.h> 89#include <utmp.h> 90 91#include "pathnames.h" 92#include "extern.h" 93 94#if __STDC__ 95#include <stdarg.h> 96#else 97#include <varargs.h> 98#endif 99 100static char version[] = "Version 6.1/OpenBSD"; 101 102extern off_t restart_point; 103extern char cbuf[]; 104 105struct sockaddr_in server_addr; 106struct sockaddr_in ctrl_addr; 107struct sockaddr_in data_source; 108struct sockaddr_in data_dest; 109struct sockaddr_in his_addr; 110struct sockaddr_in pasv_addr; 111 112int daemon_mode = 0; 113int data; 114jmp_buf errcatch, urgcatch; 115int logged_in; 116struct passwd *pw; 117int debug = 0; 118int timeout = 900; /* timeout after 15 minutes of inactivity */ 119int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 120int logging; 121int high_data_ports = 0; 122int anon_only = 0; 123int multihome = 0; 124int guest; 125int stats; 126int statfd = -1; 127int dochroot; 128int type; 129int form; 130int stru; /* avoid C keyword */ 131int mode; 132int doutmp = 0; /* update utmp file */ 133int usedefault = 1; /* for data transfers */ 134int pdata = -1; /* for passive mode */ 135sig_atomic_t transflag; 136off_t file_size; 137off_t byte_count; 138#if !defined(CMASK) || CMASK == 0 139#undef CMASK 140#define CMASK 027 141#endif 142int defumask = CMASK; /* default umask value */ 143char tmpline[7]; 144char hostname[MAXHOSTNAMELEN]; 145char remotehost[MAXHOSTNAMELEN]; 146char dhostname[MAXHOSTNAMELEN]; 147char *guestpw; 148static char ttyline[20]; 149char *tty = ttyline; /* for klogin */ 150static struct utmp utmp; /* for utmp */ 151 152#if defined(KERBEROS) 153int notickets = 1; 154char *krbtkfile_env = NULL; 155#endif 156 157char *ident = NULL; 158 159 160/* 161 * Timeout intervals for retrying connections 162 * to hosts that don't accept PORT cmds. This 163 * is a kludge, but given the problems with TCP... 164 */ 165#define SWAITMAX 90 /* wait at most 90 seconds */ 166#define SWAITINT 5 /* interval between retries */ 167 168int swaitmax = SWAITMAX; 169int swaitint = SWAITINT; 170 171#ifdef HASSETPROCTITLE 172char proctitle[BUFSIZ]; /* initial part of title */ 173#endif /* HASSETPROCTITLE */ 174 175#define LOGCMD(cmd, file) \ 176 if (logging > 1) \ 177 syslog(LOG_INFO,"%s %s%s", cmd, \ 178 *(file) == '/' ? "" : curdir(), file); 179#define LOGCMD2(cmd, file1, file2) \ 180 if (logging > 1) \ 181 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 182 *(file1) == '/' ? "" : curdir(), file1, \ 183 *(file2) == '/' ? "" : curdir(), file2); 184#define LOGBYTES(cmd, file, cnt) \ 185 if (logging > 1) { \ 186 if (cnt == (off_t)-1) \ 187 syslog(LOG_INFO,"%s %s%s", cmd, \ 188 *(file) == '/' ? "" : curdir(), file); \ 189 else \ 190 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 191 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 192 } 193 194static void ack __P((char *)); 195static void myoob __P((int)); 196static int checkuser __P((char *, char *)); 197static FILE *dataconn __P((char *, off_t, char *)); 198static void dolog __P((struct sockaddr_in *)); 199static char *curdir __P((void)); 200static void end_login __P((void)); 201static FILE *getdatasock __P((char *)); 202static char *gunique __P((char *)); 203static void lostconn __P((int)); 204static void sigquit __P((int)); 205static int receive_data __P((FILE *, FILE *)); 206static void send_data __P((FILE *, FILE *, off_t, off_t, int)); 207static struct passwd * 208 sgetpwnam __P((char *)); 209static char *sgetsave __P((char *)); 210static void reapchild __P((int)); 211 212void logxfer __P((char *, off_t, time_t)); 213 214static char * 215curdir() 216{ 217 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 218 219 if (getcwd(path, sizeof(path)-2) == NULL) 220 return (""); 221 if (path[1] != '\0') /* special case for root dir. */ 222 strcat(path, "/"); 223 /* For guest account, skip / since it's chrooted */ 224 return (guest ? path+1 : path); 225} 226 227int 228main(argc, argv, envp) 229 int argc; 230 char *argv[]; 231 char **envp; 232{ 233 int addrlen, ch, on = 1, tos; 234 char *cp, line[LINE_MAX]; 235 FILE *fd; 236 char *argstr = "AdDhlMSt:T:u:Uv"; 237 struct hostent *hp; 238 239 tzset(); /* in case no timezone database in ~ftp */ 240 241 /* set this here so klogin can use it... */ 242 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 243 244 while ((ch = getopt(argc, argv, argstr)) != EOF) { 245 switch (ch) { 246 case 'A': 247 anon_only = 1; 248 break; 249 250 case 'd': 251 debug = 1; 252 break; 253 254 case 'D': 255 daemon_mode = 1; 256 break; 257 258 case 'h': 259 high_data_ports = 1; 260 break; 261 262 case 'l': 263 logging++; /* > 1 == extra logging */ 264 break; 265 266 case 'M': 267 multihome = 1; 268 break; 269 270 case 'S': 271 stats = 1; 272 break; 273 274 case 't': 275 timeout = atoi(optarg); 276 if (maxtimeout < timeout) 277 maxtimeout = timeout; 278 break; 279 280 case 'T': 281 maxtimeout = atoi(optarg); 282 if (timeout > maxtimeout) 283 timeout = maxtimeout; 284 break; 285 286 case 'u': 287 { 288 long val = 0; 289 290 val = strtol(optarg, &optarg, 8); 291 if (*optarg != '\0' || val < 0) 292 warnx("bad value for -u"); 293 else 294 defumask = val; 295 break; 296 } 297 298 case 'U': 299 doutmp = 1; 300 break; 301 302 case 'v': 303 debug = 1; 304 break; 305 306 default: 307 warnx("unknown flag -%c ignored", optopt); 308 break; 309 } 310 } 311 312 (void) freopen(_PATH_DEVNULL, "w", stderr); 313 314 /* 315 * LOG_NDELAY sets up the logging connection immediately, 316 * necessary for anonymous ftp's that chroot and can't do it later. 317 */ 318 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 319 320 if (daemon_mode) { 321 int ctl_sock, fd; 322 struct servent *sv; 323 324 /* 325 * Detach from parent. 326 */ 327 if (daemon(1, 1) < 0) { 328 syslog(LOG_ERR, "failed to become a daemon"); 329 exit(1); 330 } 331 (void) signal(SIGCHLD, reapchild); 332 /* 333 * Get port number for ftp/tcp. 334 */ 335 sv = getservbyname("ftp", "tcp"); 336 if (sv == NULL) { 337 syslog(LOG_ERR, "getservbyname for ftp failed"); 338 exit(1); 339 } 340 /* 341 * Open a socket, bind it to the FTP port, and start 342 * listening. 343 */ 344 ctl_sock = socket(AF_INET, SOCK_STREAM, 0); 345 if (ctl_sock < 0) { 346 syslog(LOG_ERR, "control socket: %m"); 347 exit(1); 348 } 349 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR, 350 (char *)&on, sizeof(on)) < 0) 351 syslog(LOG_ERR, "control setsockopt: %m");; 352 server_addr.sin_family = AF_INET; 353 server_addr.sin_addr.s_addr = INADDR_ANY; 354 server_addr.sin_port = sv->s_port; 355 if (bind(ctl_sock, (struct sockaddr *)&server_addr, 356 sizeof(server_addr))) { 357 syslog(LOG_ERR, "control bind: %m"); 358 exit(1); 359 } 360 if (listen(ctl_sock, 32) < 0) { 361 syslog(LOG_ERR, "control listen: %m"); 362 exit(1); 363 } 364 /* 365 * Loop forever accepting connection requests and forking off 366 * children to handle them. 367 */ 368 while (1) { 369 addrlen = sizeof(his_addr); 370 fd = accept(ctl_sock, (struct sockaddr *)&his_addr, 371 &addrlen); 372 if (fork() == 0) { 373 /* child */ 374 (void) dup2(fd, 0); 375 (void) dup2(fd, 1); 376 close(ctl_sock); 377 break; 378 } 379 close(fd); 380 } 381 } else { 382 addrlen = sizeof(his_addr); 383 if (getpeername(0, (struct sockaddr *)&his_addr, 384 &addrlen) < 0) { 385 syslog(LOG_ERR, "getpeername (%s): %m", argv[0]); 386 exit(1); 387 } 388 } 389 390 (void) signal(SIGHUP, sigquit); 391 (void) signal(SIGINT, sigquit); 392 (void) signal(SIGQUIT, sigquit); 393 (void) signal(SIGTERM, sigquit); 394 (void) signal(SIGPIPE, lostconn); 395 (void) signal(SIGCHLD, SIG_IGN); 396 if ((long)signal(SIGURG, myoob) < 0) 397 syslog(LOG_ERR, "signal: %m"); 398 399 addrlen = sizeof(ctrl_addr); 400 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 401 syslog(LOG_ERR, "getsockname (%s): %m", argv[0]); 402 exit(1); 403 } 404#ifdef IP_TOS 405 tos = IPTOS_LOWDELAY; 406 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 407 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 408#endif 409 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 410 411 /* Try to handle urgent data inline */ 412#ifdef SO_OOBINLINE 413 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 414 syslog(LOG_ERR, "setsockopt: %m"); 415#endif 416 417#ifdef F_SETOWN 418 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 419 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 420#endif 421 dolog(&his_addr); 422 /* 423 * Set up default state 424 */ 425 data = -1; 426 type = TYPE_A; 427 form = FORM_N; 428 stru = STRU_F; 429 mode = MODE_S; 430 tmpline[0] = '\0'; 431 432 /* If logins are disabled, print out the message. */ 433 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 434 while (fgets(line, sizeof(line), fd) != NULL) { 435 if ((cp = strchr(line, '\n')) != NULL) 436 *cp = '\0'; 437 lreply(530, "%s", line); 438 } 439 (void) fflush(stdout); 440 (void) fclose(fd); 441 reply(530, "System not available."); 442 exit(0); 443 } 444 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 445 while (fgets(line, sizeof(line), fd) != NULL) { 446 if ((cp = strchr(line, '\n')) != NULL) 447 *cp = '\0'; 448 lreply(220, "%s", line); 449 } 450 (void) fflush(stdout); 451 (void) fclose(fd); 452 /* reply(220,) must follow */ 453 } 454 (void) gethostname(hostname, sizeof(hostname)); 455 456 /* Make sure hostname is fully qualified. */ 457 hp = gethostbyname(hostname); 458 if (hp != NULL) 459 strcpy (hostname, hp->h_name); 460 461 if (multihome) { 462 hp = gethostbyaddr((char *) &ctrl_addr.sin_addr, 463 sizeof (struct in_addr), AF_INET); 464 if (hp != NULL) { 465 strcpy (dhostname, hp->h_name); 466 } else { 467 /* Default. */ 468 strcpy (dhostname, inet_ntoa(ctrl_addr.sin_addr)); 469 } 470 } 471 472 reply(220, "%s FTP server (%s) ready.", 473 (multihome ? dhostname : hostname), version); 474 (void) setjmp(errcatch); 475 for (;;) 476 (void) yyparse(); 477 /* NOTREACHED */ 478} 479 480/* 481 * Signal handlers. 482 */ 483 484static void 485lostconn(signo) 486 int signo; 487{ 488 489 if (debug) 490 syslog(LOG_DEBUG, "lost connection"); 491 dologout(-1); 492} 493 494static void 495sigquit(signo) 496 int signo; 497{ 498 syslog(LOG_ERR, "got signal %s", strsignal(signo)); 499 500 dologout(-1); 501} 502 503/* 504 * Helper function for sgetpwnam(). 505 */ 506static char * 507sgetsave(s) 508 char *s; 509{ 510 char *new = malloc((unsigned) strlen(s) + 1); 511 512 if (new == NULL) { 513 perror_reply(421, "Local resource failure: malloc"); 514 dologout(1); 515 /* NOTREACHED */ 516 } 517 (void) strcpy(new, s); 518 return (new); 519} 520 521/* 522 * Save the result of a getpwnam. Used for USER command, since 523 * the data returned must not be clobbered by any other command 524 * (e.g., globbing). 525 */ 526static struct passwd * 527sgetpwnam(name) 528 char *name; 529{ 530 static struct passwd save; 531 struct passwd *p; 532 533 if ((p = getpwnam(name)) == NULL) 534 return (p); 535 if (save.pw_name) { 536 free(save.pw_name); 537 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 538 free(save.pw_passwd); 539 free(save.pw_gecos); 540 free(save.pw_dir); 541 free(save.pw_shell); 542 } 543 save = *p; 544 save.pw_name = sgetsave(p->pw_name); 545 save.pw_passwd = sgetsave(p->pw_passwd); 546 save.pw_gecos = sgetsave(p->pw_gecos); 547 save.pw_dir = sgetsave(p->pw_dir); 548 save.pw_shell = sgetsave(p->pw_shell); 549 return (&save); 550} 551 552static int login_attempts; /* number of failed login attempts */ 553static int askpasswd; /* had user command, ask for passwd */ 554static char curname[16]; /* current USER name */ 555 556/* 557 * USER command. 558 * Sets global passwd pointer pw if named account exists and is acceptable; 559 * sets askpasswd if a PASS command is expected. If logged in previously, 560 * need to reset state. If name is "ftp" or "anonymous", the name is not in 561 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 562 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 563 * requesting login privileges. Disallow anyone who does not have a standard 564 * shell as returned by getusershell(). Disallow anyone mentioned in the file 565 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 566 */ 567void 568user(name) 569 char *name; 570{ 571 char *cp, *shell; 572 573 if (logged_in) { 574 if (guest) { 575 reply(530, "Can't change user from guest login."); 576 return; 577 } else if (dochroot) { 578 reply(530, "Can't change user from chroot user."); 579 return; 580 } 581 end_login(); 582 } 583 584 guest = 0; 585 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 586 if (checkuser(_PATH_FTPUSERS, "ftp") || 587 checkuser(_PATH_FTPUSERS, "anonymous")) 588 reply(530, "User %s access denied.", name); 589 else if ((pw = sgetpwnam("ftp")) != NULL) { 590 guest = 1; 591 askpasswd = 1; 592 reply(331, 593 "Guest login ok, type your name as password."); 594 } else 595 reply(530, "User %s unknown.", name); 596 if (!askpasswd && logging) 597 syslog(LOG_NOTICE, 598 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 599 return; 600 } 601 if (anon_only != 0) { 602 reply(530, "Sorry, only anonymous ftp allowed."); 603 return; 604 } 605 606 if (pw = sgetpwnam(name)) { 607 if ((shell = pw->pw_shell) == NULL || *shell == 0) 608 shell = _PATH_BSHELL; 609 while ((cp = getusershell()) != NULL) 610 if (strcmp(cp, shell) == 0) 611 break; 612 endusershell(); 613 614 if (cp == NULL || checkuser(_PATH_FTPUSERS, name)) { 615 reply(530, "User %s access denied.", name); 616 if (logging) 617 syslog(LOG_NOTICE, 618 "FTP LOGIN REFUSED FROM %s, %s", 619 remotehost, name); 620 pw = (struct passwd *) NULL; 621 return; 622 } 623 } 624 if (logging) { 625 strncpy(curname, name, sizeof(curname)-1); 626 curname[sizeof(curname)-1] = '\0'; 627 } 628#ifdef SKEY 629 if (!skey_haskey(name)) { 630 char *myskey, *skey_keyinfo __P((char *name)); 631 632 myskey = skey_keyinfo(name); 633 reply(331, "Password [ %s ] for %s required.", 634 myskey ? myskey : "error getting challenge", name); 635 } else 636#endif 637 reply(331, "Password required for %s.", name); 638 639 askpasswd = 1; 640 /* 641 * Delay before reading passwd after first failed 642 * attempt to slow down passwd-guessing programs. 643 */ 644 if (login_attempts) 645 sleep((unsigned) login_attempts); 646} 647 648/* 649 * Check if a user is in the file "fname" 650 */ 651static int 652checkuser(fname, name) 653 char *fname; 654 char *name; 655{ 656 FILE *fd; 657 int found = 0; 658 char *p, line[BUFSIZ]; 659 660 if ((fd = fopen(fname, "r")) != NULL) { 661 while (fgets(line, sizeof(line), fd) != NULL) 662 if ((p = strchr(line, '\n')) != NULL) { 663 *p = '\0'; 664 if (line[0] == '#') 665 continue; 666 if (strcmp(line, name) == 0) { 667 found = 1; 668 break; 669 } 670 } 671 (void) fclose(fd); 672 } 673 return (found); 674} 675 676/* 677 * Terminate login as previous user, if any, resetting state; 678 * used when USER command is given or login fails. 679 */ 680static void 681end_login() 682{ 683 684 (void) seteuid((uid_t)0); 685 if (logged_in) { 686 logwtmp(ttyline, "", ""); 687 if (doutmp) 688 logout(utmp.ut_line); 689 } 690 pw = NULL; 691 logged_in = 0; 692 guest = 0; 693 dochroot = 0; 694} 695 696void 697pass(passwd) 698 char *passwd; 699{ 700 int rval; 701 FILE *fd; 702 static char homedir[MAXPATHLEN]; 703 char rootdir[MAXPATHLEN]; 704 705 if (logged_in || askpasswd == 0) { 706 reply(503, "Login with USER first."); 707 return; 708 } 709 askpasswd = 0; 710 if (!guest) { /* "ftp" is only account allowed no password */ 711 if (pw == NULL) { 712 rval = 1; /* failure below */ 713 goto skip; 714 } 715#if defined(KERBEROS) 716 rval = klogin(pw, "", hostname, passwd); 717 if (rval == 0) 718 goto skip; 719#endif 720#ifdef SKEY 721 if (skey_haskey(pw->pw_name) == 0 && 722 (skey_passcheck(pw->pw_name, passwd) != -1)) { 723 rval = 0; 724 goto skip; 725 } 726#endif 727 /* the strcmp does not catch null passwords! */ 728 if (pw == NULL || *pw->pw_passwd == '\0' || 729 strcmp(crypt(passwd, (pw ? pw->pw_passwd : "xx")), pw->pw_passwd)) { 730 rval = 1; /* failure */ 731 goto skip; 732 } 733 rval = 0; 734 735skip: 736 /* 737 * If rval == 1, the user failed the authentication check 738 * above. If rval == 0, either Kerberos or local authentication 739 * succeeded. 740 */ 741 if (rval) { 742 reply(530, "Login incorrect."); 743 if (logging) 744 syslog(LOG_NOTICE, 745 "FTP LOGIN FAILED FROM %s, %s", 746 remotehost, curname); 747 pw = NULL; 748 if (login_attempts++ >= 5) { 749 syslog(LOG_NOTICE, 750 "repeated login failures from %s", 751 remotehost); 752 exit(0); 753 } 754 return; 755 } 756 } else { 757 /* Save anonymous' password. */ 758 guestpw = strdup(passwd); 759 if (guestpw == (char *)NULL) 760 fatal("Out of memory"); 761 } 762 login_attempts = 0; /* this time successful */ 763 if (setegid((gid_t)pw->pw_gid) < 0) { 764 reply(550, "Can't set gid."); 765 return; 766 } 767 (void) initgroups(pw->pw_name, pw->pw_gid); 768 769 /* open wtmp before chroot */ 770 logwtmp(ttyline, pw->pw_name, remotehost); 771 772 /* open utmp before chroot */ 773 if (doutmp) { 774 memset((void *)&utmp, 0, sizeof(utmp)); 775 (void)time(&utmp.ut_time); 776 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 777 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 778 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 779 login(&utmp); 780 } 781 782 /* open stats file before chroot */ 783 if (guest && (stats == 1) && (statfd < 0)) 784 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 785 stats = 0; 786 787 logged_in = 1; 788 789 dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name); 790 if (guest || dochroot) { 791 if (multihome) { 792 struct stat ts; 793 794 /* Compute root directory. */ 795 snprintf (rootdir, sizeof(rootdir), "%s/%s", 796 pw->pw_dir, dhostname); 797 if (stat(rootdir, &ts) < 0) { 798 snprintf (rootdir, sizeof(rootdir), "%s/%s", 799 pw->pw_dir, hostname); 800 } 801 } else 802 strcpy (rootdir, pw->pw_dir); 803 } 804 if (guest) { 805 /* 806 * We MUST do a chdir() after the chroot. Otherwise 807 * the old current directory will be accessible as "." 808 * outside the new root! 809 */ 810 if (chroot(rootdir) < 0 || chdir("/") < 0) { 811 reply(550, "Can't set guest privileges."); 812 goto bad; 813 } 814 strcpy(pw->pw_dir, "/"); 815 setenv("HOME", "/", 1); 816 } else if (dochroot) { 817 if (chroot(rootdir) < 0 || chdir("/") < 0) { 818 reply(550, "Can't change root."); 819 goto bad; 820 } 821 strcpy(pw->pw_dir, "/"); 822 setenv("HOME", "/", 1); 823 } else if (chdir(pw->pw_dir) < 0) { 824 if (chdir("/") < 0) { 825 reply(530, "User %s: can't change directory to %s.", 826 pw->pw_name, pw->pw_dir); 827 goto bad; 828 } else 829 lreply(230, "No directory! Logging in with home=/"); 830 } 831 if (seteuid((uid_t)pw->pw_uid) < 0) { 832 reply(550, "Can't set uid."); 833 goto bad; 834 } 835 836 /* 837 * Set home directory so that use of ~ (tilde) works correctly. 838 */ 839 if (getcwd(homedir, MAXPATHLEN) != NULL) 840 setenv("HOME", homedir, 1); 841 842 /* 843 * Display a login message, if it exists. 844 * N.B. reply(230,) must follow the message. 845 */ 846 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 847 char *cp, line[LINE_MAX]; 848 849 while (fgets(line, sizeof(line), fd) != NULL) { 850 if ((cp = strchr(line, '\n')) != NULL) 851 *cp = '\0'; 852 lreply(230, "%s", line); 853 } 854 (void) fflush(stdout); 855 (void) fclose(fd); 856 } 857 if (guest) { 858 if (ident != NULL) 859 free(ident); 860 ident = strdup(passwd); 861 if (ident == (char *)NULL) 862 fatal("Ran out of memory."); 863 reply(230, "Guest login ok, access restrictions apply."); 864#ifdef HASSETPROCTITLE 865 snprintf(proctitle, sizeof(proctitle), 866 "%s: anonymous/%.*s", remotehost, 867 sizeof(proctitle) - sizeof(remotehost) - 868 sizeof(": anonymous/"), passwd); 869 setproctitle(proctitle); 870#endif /* HASSETPROCTITLE */ 871 if (logging) 872 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 873 remotehost, passwd); 874 } else { 875 reply(230, "User %s logged in.", pw->pw_name); 876#ifdef HASSETPROCTITLE 877 snprintf(proctitle, sizeof(proctitle), 878 "%s: %s", remotehost, pw->pw_name); 879 setproctitle(proctitle); 880#endif /* HASSETPROCTITLE */ 881 if (logging) 882 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 883 remotehost, pw->pw_name); 884 } 885 (void) umask(defumask); 886 return; 887bad: 888 /* Forget all about it... */ 889 end_login(); 890} 891 892void 893retrieve(cmd, name) 894 char *cmd, *name; 895{ 896 FILE *fin, *dout; 897 struct stat st; 898 int (*closefunc) __P((FILE *)); 899 time_t start; 900 901 if (cmd == 0) { 902 fin = fopen(name, "r"), closefunc = fclose; 903 st.st_size = 0; 904 } else { 905 char line[BUFSIZ]; 906 907 (void) snprintf(line, sizeof(line), cmd, name); 908 name = line; 909 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 910 st.st_size = -1; 911 st.st_blksize = BUFSIZ; 912 } 913 if (fin == NULL) { 914 if (errno != 0) { 915 perror_reply(550, name); 916 if (cmd == 0) { 917 LOGCMD("get", name); 918 } 919 } 920 return; 921 } 922 byte_count = -1; 923 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 924 reply(550, "%s: not a plain file.", name); 925 goto done; 926 } 927 if (restart_point) { 928 if (type == TYPE_A) { 929 off_t i, n; 930 int c; 931 932 n = restart_point; 933 i = 0; 934 while (i++ < n) { 935 if ((c=getc(fin)) == EOF) { 936 perror_reply(550, name); 937 goto done; 938 } 939 if (c == '\n') 940 i++; 941 } 942 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 943 perror_reply(550, name); 944 goto done; 945 } 946 } 947 dout = dataconn(name, st.st_size, "w"); 948 if (dout == NULL) 949 goto done; 950 time(&start); 951 send_data(fin, dout, st.st_blksize, st.st_size, 952 (restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode))); 953 if ((cmd == 0) && stats) 954 logxfer(name, st.st_size, start); 955 (void) fclose(dout); 956 data = -1; 957 pdata = -1; 958done: 959 if (cmd == 0) 960 LOGBYTES("get", name, byte_count); 961 (*closefunc)(fin); 962} 963 964void 965store(name, mode, unique) 966 char *name, *mode; 967 int unique; 968{ 969 FILE *fout, *din; 970 struct stat st; 971 int (*closefunc) __P((FILE *)); 972 973 if (unique && stat(name, &st) == 0 && 974 (name = gunique(name)) == NULL) { 975 LOGCMD(*mode == 'w' ? "put" : "append", name); 976 return; 977 } 978 979 if (restart_point) 980 mode = "r+"; 981 fout = fopen(name, mode); 982 closefunc = fclose; 983 if (fout == NULL) { 984 perror_reply(553, name); 985 LOGCMD(*mode == 'w' ? "put" : "append", name); 986 return; 987 } 988 byte_count = -1; 989 if (restart_point) { 990 if (type == TYPE_A) { 991 off_t i, n; 992 int c; 993 994 n = restart_point; 995 i = 0; 996 while (i++ < n) { 997 if ((c=getc(fout)) == EOF) { 998 perror_reply(550, name); 999 goto done; 1000 } 1001 if (c == '\n') 1002 i++; 1003 } 1004 /* 1005 * We must do this seek to "current" position 1006 * because we are changing from reading to 1007 * writing. 1008 */ 1009 if (fseek(fout, 0L, L_INCR) < 0) { 1010 perror_reply(550, name); 1011 goto done; 1012 } 1013 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1014 perror_reply(550, name); 1015 goto done; 1016 } 1017 } 1018 din = dataconn(name, (off_t)-1, "r"); 1019 if (din == NULL) 1020 goto done; 1021 if (receive_data(din, fout) == 0) { 1022 if (unique) 1023 reply(226, "Transfer complete (unique file name:%s).", 1024 name); 1025 else 1026 reply(226, "Transfer complete."); 1027 } 1028 (void) fclose(din); 1029 data = -1; 1030 pdata = -1; 1031done: 1032 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 1033 (*closefunc)(fout); 1034} 1035 1036static FILE * 1037getdatasock(mode) 1038 char *mode; 1039{ 1040 int on = 1, s, t, tries; 1041 1042 if (data >= 0) 1043 return (fdopen(data, mode)); 1044 (void) seteuid((uid_t)0); 1045 s = socket(AF_INET, SOCK_STREAM, 0); 1046 if (s < 0) 1047 goto bad; 1048 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1049 (char *) &on, sizeof(on)) < 0) 1050 goto bad; 1051 /* anchor socket to avoid multi-homing problems */ 1052 data_source.sin_len = sizeof(struct sockaddr_in); 1053 data_source.sin_family = AF_INET; 1054 data_source.sin_addr = ctrl_addr.sin_addr; 1055 for (tries = 1; ; tries++) { 1056 if (bind(s, (struct sockaddr *)&data_source, 1057 sizeof(data_source)) >= 0) 1058 break; 1059 if (errno != EADDRINUSE || tries > 10) 1060 goto bad; 1061 sleep(tries); 1062 } 1063 (void) seteuid((uid_t)pw->pw_uid); 1064#ifdef IP_TOS 1065 on = IPTOS_THROUGHPUT; 1066 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 1067 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1068#endif 1069#ifdef TCP_NOPUSH 1070 /* 1071 * Turn off push flag to keep sender TCP from sending short packets 1072 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1073 * to set the send buffer size as well, but that may not be desirable 1074 * in heavy-load situations. 1075 */ 1076 on = 1; 1077 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, (char *)&on, sizeof on) < 0) 1078 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 1079#endif 1080#ifdef SO_SNDBUF 1081 on = 65536; 1082 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&on, sizeof on) < 0) 1083 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 1084#endif 1085 1086 return (fdopen(s, mode)); 1087bad: 1088 /* Return the real value of errno (close may change it) */ 1089 t = errno; 1090 (void) seteuid((uid_t)pw->pw_uid); 1091 (void) close(s); 1092 errno = t; 1093 return (NULL); 1094} 1095 1096static FILE * 1097dataconn(name, size, mode) 1098 char *name; 1099 off_t size; 1100 char *mode; 1101{ 1102 char sizebuf[32]; 1103 FILE *file; 1104 int retry = 0, tos; 1105 1106 file_size = size; 1107 byte_count = 0; 1108 if (size != (off_t) -1) { 1109 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 1110 size); 1111 } else 1112 sizebuf[0] = '\0'; 1113 if (pdata >= 0) { 1114 struct sockaddr_in from; 1115 int s, fromlen = sizeof(from); 1116 1117 signal (SIGALRM, toolong); 1118 (void) alarm ((unsigned) timeout); 1119 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1120 (void) alarm (0); 1121 if (s < 0) { 1122 reply(425, "Can't open data connection."); 1123 (void) close(pdata); 1124 pdata = -1; 1125 return (NULL); 1126 } 1127 if (ntohs(from.sin_port) < IPPORT_RESERVED) { 1128 perror_reply(425, "Can't build data connection"); 1129 (void) close(pdata); 1130 (void) close(s); 1131 pdata = -1; 1132 return (NULL); 1133 } 1134 if (from.sin_addr.s_addr != his_addr.sin_addr.s_addr) { 1135 perror_reply(435, "Can't build data connection"); 1136 (void) close(pdata); 1137 (void) close(s); 1138 pdata = -1; 1139 return (NULL); 1140 } 1141 (void) close(pdata); 1142 pdata = s; 1143#ifdef IP_TOS 1144 tos = IPTOS_THROUGHPUT; 1145 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 1146 sizeof(int)); 1147#endif 1148 reply(150, "Opening %s mode data connection for '%s'%s.", 1149 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1150 return (fdopen(pdata, mode)); 1151 } 1152 if (data >= 0) { 1153 reply(125, "Using existing data connection for '%s'%s.", 1154 name, sizebuf); 1155 usedefault = 1; 1156 return (fdopen(data, mode)); 1157 } 1158 if (usedefault) 1159 data_dest = his_addr; 1160 usedefault = 1; 1161 file = getdatasock(mode); 1162 if (file == NULL) { 1163 reply(425, "Can't create data socket (%s,%d): %s.", 1164 inet_ntoa(data_source.sin_addr), 1165 ntohs(data_source.sin_port), strerror(errno)); 1166 return (NULL); 1167 } 1168 data = fileno(file); 1169 1170 /* 1171 * attempt to connect to reserved port on client machine; 1172 * this looks like an attack 1173 */ 1174 if (ntohs(data_dest.sin_port) < IPPORT_RESERVED) { 1175 perror_reply(425, "Can't build data connection"); 1176 (void) fclose(file); 1177 data = -1; 1178 return NULL; 1179 } 1180 if (data_dest.sin_addr.s_addr != his_addr.sin_addr.s_addr) { 1181 perror_reply(435, "Can't build data connection"); 1182 (void) fclose(file); 1183 data = -1; 1184 return NULL; 1185 } 1186 while (connect(data, (struct sockaddr *)&data_dest, 1187 sizeof(data_dest)) < 0) { 1188 if (errno == EADDRINUSE && retry < swaitmax) { 1189 sleep((unsigned) swaitint); 1190 retry += swaitint; 1191 continue; 1192 } 1193 perror_reply(425, "Can't build data connection"); 1194 (void) fclose(file); 1195 data = -1; 1196 return (NULL); 1197 } 1198 reply(150, "Opening %s mode data connection for '%s'%s.", 1199 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1200 return (file); 1201} 1202 1203/* 1204 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1205 * encapsulation of the data subject to Mode, Structure, and Type. 1206 * 1207 * NB: Form isn't handled. 1208 */ 1209static void 1210send_data(instr, outstr, blksize, filesize, isreg) 1211 FILE *instr, *outstr; 1212 off_t blksize; 1213 off_t filesize; 1214 int isreg; 1215{ 1216 int c, cnt, filefd, netfd; 1217 char *buf, *bp; 1218 size_t len; 1219 1220 transflag++; 1221 if (setjmp(urgcatch)) { 1222 transflag = 0; 1223 return; 1224 } 1225 switch (type) { 1226 1227 case TYPE_A: 1228 while ((c = getc(instr)) != EOF) { 1229 byte_count++; 1230 if (c == '\n') { 1231 if (ferror(outstr)) 1232 goto data_err; 1233 (void) putc('\r', outstr); 1234 } 1235 (void) putc(c, outstr); 1236 } 1237 fflush(outstr); 1238 transflag = 0; 1239 if (ferror(instr)) 1240 goto file_err; 1241 if (ferror(outstr)) 1242 goto data_err; 1243 reply(226, "Transfer complete."); 1244 return; 1245 1246 case TYPE_I: 1247 case TYPE_L: 1248 /* 1249 * isreg is only set if we are not doing restart and we 1250 * are sending a regular file 1251 */ 1252 netfd = fileno(outstr); 1253 filefd = fileno(instr); 1254 1255 if (isreg && filesize < (off_t)16 * 1024 * 1024) { 1256 buf = mmap(0, filesize, PROT_READ, MAP_SHARED, filefd, 1257 (off_t)0); 1258 if (!buf) { 1259 syslog(LOG_WARNING, "mmap(%lu): %m", 1260 (unsigned long)filesize); 1261 goto oldway; 1262 } 1263 bp = buf; 1264 len = filesize; 1265 do { 1266 cnt = write(netfd, bp, len); 1267 len -= cnt; 1268 bp += cnt; 1269 if (cnt > 0) byte_count += cnt; 1270 } while(cnt > 0 && len > 0); 1271 1272 transflag = 0; 1273 munmap(buf, (size_t)filesize); 1274 if (cnt < 0) 1275 goto data_err; 1276 reply(226, "Transfer complete."); 1277 return; 1278 } 1279 1280oldway: 1281 if ((buf = malloc((u_int)blksize)) == NULL) { 1282 transflag = 0; 1283 perror_reply(451, "Local resource failure: malloc"); 1284 return; 1285 } 1286 1287 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1288 write(netfd, buf, cnt) == cnt) 1289 byte_count += cnt; 1290 transflag = 0; 1291 (void)free(buf); 1292 if (cnt != 0) { 1293 if (cnt < 0) 1294 goto file_err; 1295 goto data_err; 1296 } 1297 reply(226, "Transfer complete."); 1298 return; 1299 default: 1300 transflag = 0; 1301 reply(550, "Unimplemented TYPE %d in send_data", type); 1302 return; 1303 } 1304 1305data_err: 1306 transflag = 0; 1307 perror_reply(426, "Data connection"); 1308 return; 1309 1310file_err: 1311 transflag = 0; 1312 perror_reply(551, "Error on input file"); 1313} 1314 1315/* 1316 * Transfer data from peer to "outstr" using the appropriate encapulation of 1317 * the data subject to Mode, Structure, and Type. 1318 * 1319 * N.B.: Form isn't handled. 1320 */ 1321static int 1322receive_data(instr, outstr) 1323 FILE *instr, *outstr; 1324{ 1325 int c; 1326 int cnt, bare_lfs = 0; 1327 char buf[BUFSIZ]; 1328 1329 transflag++; 1330 if (setjmp(urgcatch)) { 1331 transflag = 0; 1332 return (-1); 1333 } 1334 switch (type) { 1335 1336 case TYPE_I: 1337 case TYPE_L: 1338 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1339 if (write(fileno(outstr), buf, cnt) != cnt) 1340 goto file_err; 1341 byte_count += cnt; 1342 } 1343 if (cnt < 0) 1344 goto data_err; 1345 transflag = 0; 1346 return (0); 1347 1348 case TYPE_E: 1349 reply(553, "TYPE E not implemented."); 1350 transflag = 0; 1351 return (-1); 1352 1353 case TYPE_A: 1354 while ((c = getc(instr)) != EOF) { 1355 byte_count++; 1356 if (c == '\n') 1357 bare_lfs++; 1358 while (c == '\r') { 1359 if (ferror(outstr)) 1360 goto data_err; 1361 if ((c = getc(instr)) != '\n') { 1362 (void) putc ('\r', outstr); 1363 if (c == '\0' || c == EOF) 1364 goto contin2; 1365 } 1366 } 1367 (void) putc(c, outstr); 1368 contin2: ; 1369 } 1370 fflush(outstr); 1371 if (ferror(instr)) 1372 goto data_err; 1373 if (ferror(outstr)) 1374 goto file_err; 1375 transflag = 0; 1376 if (bare_lfs) { 1377 lreply(226, 1378 "WARNING! %d bare linefeeds received in ASCII mode", 1379 bare_lfs); 1380 (void)printf(" File may not have transferred correctly.\r\n"); 1381 } 1382 return (0); 1383 default: 1384 reply(550, "Unimplemented TYPE %d in receive_data", type); 1385 transflag = 0; 1386 return (-1); 1387 } 1388 1389data_err: 1390 transflag = 0; 1391 perror_reply(426, "Data Connection"); 1392 return (-1); 1393 1394file_err: 1395 transflag = 0; 1396 perror_reply(452, "Error writing file"); 1397 return (-1); 1398} 1399 1400void 1401statfilecmd(filename) 1402 char *filename; 1403{ 1404 FILE *fin; 1405 int c; 1406 char line[LINE_MAX]; 1407 1408 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1409 fin = ftpd_popen(line, "r"); 1410 lreply(211, "status of %s:", filename); 1411 while ((c = getc(fin)) != EOF) { 1412 if (c == '\n') { 1413 if (ferror(stdout)){ 1414 perror_reply(421, "control connection"); 1415 (void) ftpd_pclose(fin); 1416 dologout(1); 1417 /* NOTREACHED */ 1418 } 1419 if (ferror(fin)) { 1420 perror_reply(551, filename); 1421 (void) ftpd_pclose(fin); 1422 return; 1423 } 1424 (void) putc('\r', stdout); 1425 } 1426 (void) putc(c, stdout); 1427 } 1428 (void) ftpd_pclose(fin); 1429 reply(211, "End of Status"); 1430} 1431 1432void 1433statcmd() 1434{ 1435 struct sockaddr_in *sin; 1436 u_char *a, *p; 1437 1438 lreply(211, "%s FTP server status:", hostname, version); 1439 printf(" %s\r\n", version); 1440 printf(" Connected to %s", remotehost); 1441 if (!isdigit(remotehost[0])) 1442 printf(" (%s)", inet_ntoa(his_addr.sin_addr)); 1443 printf("\r\n"); 1444 if (logged_in) { 1445 if (guest) 1446 printf(" Logged in anonymously\r\n"); 1447 else 1448 printf(" Logged in as %s\r\n", pw->pw_name); 1449 } else if (askpasswd) 1450 printf(" Waiting for password\r\n"); 1451 else 1452 printf(" Waiting for user name\r\n"); 1453 printf(" TYPE: %s", typenames[type]); 1454 if (type == TYPE_A || type == TYPE_E) 1455 printf(", FORM: %s", formnames[form]); 1456 if (type == TYPE_L) 1457#if NBBY == 8 1458 printf(" %d", NBBY); 1459#else 1460 printf(" %d", bytesize); /* need definition! */ 1461#endif 1462 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1463 strunames[stru], modenames[mode]); 1464 if (data != -1) 1465 printf(" Data connection open\r\n"); 1466 else if (pdata != -1) { 1467 printf(" in Passive mode"); 1468 sin = &pasv_addr; 1469 goto printaddr; 1470 } else if (usedefault == 0) { 1471 printf(" PORT"); 1472 sin = &data_dest; 1473printaddr: 1474 a = (u_char *) &sin->sin_addr; 1475 p = (u_char *) &sin->sin_port; 1476#define UC(b) (((int) b) & 0xff) 1477 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1478 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1479#undef UC 1480 } else 1481 printf(" No data connection\r\n"); 1482 reply(211, "End of status"); 1483} 1484 1485void 1486fatal(s) 1487 char *s; 1488{ 1489 1490 reply(451, "Error in server: %s\n", s); 1491 reply(221, "Closing connection due to server error."); 1492 dologout(0); 1493 /* NOTREACHED */ 1494} 1495 1496void 1497#if __STDC__ 1498reply(int n, const char *fmt, ...) 1499#else 1500reply(n, fmt, va_alist) 1501 int n; 1502 char *fmt; 1503 va_dcl 1504#endif 1505{ 1506 va_list ap; 1507#if __STDC__ 1508 va_start(ap, fmt); 1509#else 1510 va_start(ap); 1511#endif 1512 (void)printf("%d ", n); 1513 (void)vprintf(fmt, ap); 1514 (void)printf("\r\n"); 1515 (void)fflush(stdout); 1516 if (debug) { 1517 syslog(LOG_DEBUG, "<--- %d ", n); 1518 vsyslog(LOG_DEBUG, fmt, ap); 1519 } 1520} 1521 1522void 1523#if __STDC__ 1524lreply(int n, const char *fmt, ...) 1525#else 1526lreply(n, fmt, va_alist) 1527 int n; 1528 char *fmt; 1529 va_dcl 1530#endif 1531{ 1532 va_list ap; 1533#if __STDC__ 1534 va_start(ap, fmt); 1535#else 1536 va_start(ap); 1537#endif 1538 (void)printf("%d- ", n); 1539 (void)vprintf(fmt, ap); 1540 (void)printf("\r\n"); 1541 (void)fflush(stdout); 1542 if (debug) { 1543 syslog(LOG_DEBUG, "<--- %d- ", n); 1544 vsyslog(LOG_DEBUG, fmt, ap); 1545 } 1546} 1547 1548static void 1549ack(s) 1550 char *s; 1551{ 1552 1553 reply(250, "%s command successful.", s); 1554} 1555 1556void 1557nack(s) 1558 char *s; 1559{ 1560 1561 reply(502, "%s command not implemented.", s); 1562} 1563 1564/* ARGSUSED */ 1565void 1566yyerror(s) 1567 char *s; 1568{ 1569 char *cp; 1570 1571 if (cp = strchr(cbuf,'\n')) 1572 *cp = '\0'; 1573 reply(500, "'%s': command not understood.", cbuf); 1574} 1575 1576void 1577delete(name) 1578 char *name; 1579{ 1580 struct stat st; 1581 1582 LOGCMD("delete", name); 1583 if (stat(name, &st) < 0) { 1584 perror_reply(550, name); 1585 return; 1586 } 1587 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1588 if (rmdir(name) < 0) { 1589 perror_reply(550, name); 1590 return; 1591 } 1592 goto done; 1593 } 1594 if (unlink(name) < 0) { 1595 perror_reply(550, name); 1596 return; 1597 } 1598done: 1599 ack("DELE"); 1600} 1601 1602void 1603cwd(path) 1604 char *path; 1605{ 1606 1607 if (chdir(path) < 0) 1608 perror_reply(550, path); 1609 else 1610 ack("CWD"); 1611} 1612 1613void 1614makedir(name) 1615 char *name; 1616{ 1617 1618 LOGCMD("mkdir", name); 1619 if (mkdir(name, 0777) < 0) 1620 perror_reply(550, name); 1621 else 1622 reply(257, "MKD command successful."); 1623} 1624 1625void 1626removedir(name) 1627 char *name; 1628{ 1629 1630 LOGCMD("rmdir", name); 1631 if (rmdir(name) < 0) 1632 perror_reply(550, name); 1633 else 1634 ack("RMD"); 1635} 1636 1637void 1638pwd() 1639{ 1640 char path[MAXPATHLEN + 1]; 1641 1642 if (getwd(path) == (char *)NULL) 1643 reply(550, "%s.", path); 1644 else 1645 reply(257, "\"%s\" is current directory.", path); 1646} 1647 1648char * 1649renamefrom(name) 1650 char *name; 1651{ 1652 struct stat st; 1653 1654 if (stat(name, &st) < 0) { 1655 perror_reply(550, name); 1656 return ((char *)0); 1657 } 1658 reply(350, "File exists, ready for destination name"); 1659 return (name); 1660} 1661 1662void 1663renamecmd(from, to) 1664 char *from, *to; 1665{ 1666 1667 LOGCMD2("rename", from, to); 1668 if (rename(from, to) < 0) 1669 perror_reply(550, "rename"); 1670 else 1671 ack("RNTO"); 1672} 1673 1674static void 1675dolog(sin) 1676 struct sockaddr_in *sin; 1677{ 1678 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1679 sizeof(struct in_addr), AF_INET); 1680 1681 if (hp) 1682 (void) strncpy(remotehost, hp->h_name, sizeof(remotehost)-1); 1683 else 1684 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1685 sizeof(remotehost)-1); 1686 remotehost[sizeof(remotehost)-1] = '\0'; 1687#ifdef HASSETPROCTITLE 1688 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1689 setproctitle(proctitle); 1690#endif /* HASSETPROCTITLE */ 1691 1692 if (logging) 1693 syslog(LOG_INFO, "connection from %s", remotehost); 1694} 1695 1696/* 1697 * Record logout in wtmp file 1698 * and exit with supplied status. 1699 */ 1700void 1701dologout(status) 1702 int status; 1703{ 1704 1705 if (logged_in) { 1706 (void) seteuid((uid_t)0); 1707 logwtmp(ttyline, "", ""); 1708 if (doutmp) 1709 logout(utmp.ut_line); 1710#if defined(KERBEROS) 1711 if (!notickets && krbtkfile_env) 1712 unlink(krbtkfile_env); 1713#endif 1714 } 1715 /* beware of flushing buffers after a SIGPIPE */ 1716 _exit(status); 1717} 1718 1719static void 1720myoob(signo) 1721 int signo; 1722{ 1723 char *cp; 1724 1725 /* only process if transfer occurring */ 1726 if (!transflag) 1727 return; 1728 cp = tmpline; 1729 if (getline(cp, 7, stdin) == NULL) { 1730 reply(221, "You could at least say goodbye."); 1731 dologout(0); 1732 } 1733 upper(cp); 1734 if (strcmp(cp, "ABOR\r\n") == 0) { 1735 tmpline[0] = '\0'; 1736 reply(426, "Transfer aborted. Data connection closed."); 1737 reply(226, "Abort successful"); 1738 longjmp(urgcatch, 1); 1739 } 1740 if (strcmp(cp, "STAT\r\n") == 0) { 1741 if (file_size != (off_t) -1) 1742 reply(213, "Status: %qd of %qd bytes transferred", 1743 byte_count, file_size); 1744 else 1745 reply(213, "Status: %qd bytes transferred", byte_count); 1746 } 1747} 1748 1749/* 1750 * Note: a response of 425 is not mentioned as a possible response to 1751 * the PASV command in RFC959. However, it has been blessed as 1752 * a legitimate response by Jon Postel in a telephone conversation 1753 * with Rick Adams on 25 Jan 89. 1754 */ 1755void 1756passive() 1757{ 1758 int len, on; 1759 u_short port; 1760 char *p, *a; 1761 1762 if (pw == NULL) { 1763 reply(530, "Please login with USER and PASS"); 1764 return; 1765 } 1766 if (pdata >= 0) 1767 close(pdata); 1768 pdata = socket(AF_INET, SOCK_STREAM, 0); 1769 if (pdata < 0) { 1770 perror_reply(425, "Can't open passive connection"); 1771 return; 1772 } 1773 1774#ifdef IP_PORTRANGE 1775 on = high_data_ports ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT; 1776 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 1777 (char *)&on, sizeof(on)) < 0) 1778 goto pasv_error; 1779#endif 1780 1781 pasv_addr = ctrl_addr; 1782 pasv_addr.sin_port = 0; 1783 if (bind(pdata, (struct sockaddr *)&pasv_addr, 1784 sizeof(pasv_addr)) < 0) 1785 goto pasv_error; 1786 1787 len = sizeof(pasv_addr); 1788 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1789 goto pasv_error; 1790 if (listen(pdata, 1) < 0) 1791 goto pasv_error; 1792 a = (char *) &pasv_addr.sin_addr; 1793 p = (char *) &pasv_addr.sin_port; 1794 1795#define UC(b) (((int) b) & 0xff) 1796 1797 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1798 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1799 return; 1800 1801pasv_error: 1802 (void) close(pdata); 1803 pdata = -1; 1804 perror_reply(425, "Can't open passive connection"); 1805 return; 1806} 1807 1808/* 1809 * Generate unique name for file with basename "local". 1810 * The file named "local" is already known to exist. 1811 * Generates failure reply on error. 1812 */ 1813static char * 1814gunique(local) 1815 char *local; 1816{ 1817 static char new[MAXPATHLEN]; 1818 struct stat st; 1819 int count, len; 1820 char *cp; 1821 1822 cp = strrchr(local, '/'); 1823 if (cp) 1824 *cp = '\0'; 1825 if (stat(cp ? local : ".", &st) < 0) { 1826 perror_reply(553, cp ? local : "."); 1827 return ((char *) 0); 1828 } 1829 if (cp) 1830 *cp = '/'; 1831 (void) strncpy(new, local, sizeof(new)-1); 1832 new[sizeof(new)-1] = '\0'; 1833 len = strlen(new); 1834 if (len+2+1 >= sizeof(new)-1) 1835 return (NULL); 1836 cp = new + len; 1837 *cp++ = '.'; 1838 for (count = 1; count < 100; count++) { 1839 (void)snprintf(cp, sizeof(new) - (cp - new), "%d", count); 1840 if (stat(new, &st) < 0) 1841 return (new); 1842 } 1843 reply(452, "Unique file name cannot be created."); 1844 return (NULL); 1845} 1846 1847/* 1848 * Format and send reply containing system error number. 1849 */ 1850void 1851perror_reply(code, string) 1852 int code; 1853 char *string; 1854{ 1855 1856 reply(code, "%s: %s.", string, strerror(errno)); 1857} 1858 1859static char *onefile[] = { 1860 "", 1861 0 1862}; 1863 1864void 1865send_file_list(whichf) 1866 char *whichf; 1867{ 1868 struct stat st; 1869 DIR *dirp = NULL; 1870 struct dirent *dir; 1871 FILE *dout = NULL; 1872 char **dirlist, *dirname; 1873 int simple = 0; 1874 int freeglob = 0; 1875 glob_t gl; 1876 1877 if (strpbrk(whichf, "~{[*?") != NULL) { 1878 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 1879 1880 memset(&gl, 0, sizeof(gl)); 1881 freeglob = 1; 1882 if (glob(whichf, flags, 0, &gl)) { 1883 reply(550, "not found"); 1884 goto out; 1885 } else if (gl.gl_pathc == 0) { 1886 errno = ENOENT; 1887 perror_reply(550, whichf); 1888 goto out; 1889 } 1890 dirlist = gl.gl_pathv; 1891 } else { 1892 onefile[0] = whichf; 1893 dirlist = onefile; 1894 simple = 1; 1895 } 1896 1897 if (setjmp(urgcatch)) { 1898 transflag = 0; 1899 goto out; 1900 } 1901 while (dirname = *dirlist++) { 1902 if (stat(dirname, &st) < 0) { 1903 /* 1904 * If user typed "ls -l", etc, and the client 1905 * used NLST, do what the user meant. 1906 */ 1907 if (dirname[0] == '-' && *dirlist == NULL && 1908 transflag == 0) { 1909 retrieve("/bin/ls %s", dirname); 1910 goto out; 1911 } 1912 perror_reply(550, whichf); 1913 if (dout != NULL) { 1914 (void) fclose(dout); 1915 transflag = 0; 1916 data = -1; 1917 pdata = -1; 1918 } 1919 goto out; 1920 } 1921 1922 if (S_ISREG(st.st_mode)) { 1923 if (dout == NULL) { 1924 dout = dataconn("file list", (off_t)-1, "w"); 1925 if (dout == NULL) 1926 goto out; 1927 transflag++; 1928 } 1929 fprintf(dout, "%s%s\n", dirname, 1930 type == TYPE_A ? "\r" : ""); 1931 byte_count += strlen(dirname) + 1; 1932 continue; 1933 } else if (!S_ISDIR(st.st_mode)) 1934 continue; 1935 1936 if ((dirp = opendir(dirname)) == NULL) 1937 continue; 1938 1939 while ((dir = readdir(dirp)) != NULL) { 1940 char nbuf[MAXPATHLEN]; 1941 1942 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1943 continue; 1944 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1945 dir->d_namlen == 2) 1946 continue; 1947 1948 snprintf(nbuf, sizeof(nbuf), "%s/%s", dirname, 1949 dir->d_name); 1950 1951 /* 1952 * We have to do a stat to insure it's 1953 * not a directory or special file. 1954 */ 1955 if (simple || (stat(nbuf, &st) == 0 && 1956 S_ISREG(st.st_mode))) { 1957 if (dout == NULL) { 1958 dout = dataconn("file list", (off_t)-1, 1959 "w"); 1960 if (dout == NULL) 1961 goto out; 1962 transflag++; 1963 } 1964 if (nbuf[0] == '.' && nbuf[1] == '/') 1965 fprintf(dout, "%s%s\n", &nbuf[2], 1966 type == TYPE_A ? "\r" : ""); 1967 else 1968 fprintf(dout, "%s%s\n", nbuf, 1969 type == TYPE_A ? "\r" : ""); 1970 byte_count += strlen(nbuf) + 1; 1971 } 1972 } 1973 (void) closedir(dirp); 1974 } 1975 1976 if (dout == NULL) 1977 reply(550, "No files found."); 1978 else if (ferror(dout) != 0) 1979 perror_reply(550, "Data connection"); 1980 else 1981 reply(226, "Transfer complete."); 1982 1983 transflag = 0; 1984 if (dout != NULL) 1985 (void) fclose(dout); 1986 data = -1; 1987 pdata = -1; 1988out: 1989 if (freeglob) { 1990 freeglob = 0; 1991 globfree(&gl); 1992 } 1993} 1994 1995static void 1996reapchild(signo) 1997 int signo; 1998{ 1999 while (wait3(NULL, WNOHANG, NULL) > 0); 2000} 2001 2002void 2003logxfer(name, size, start) 2004 char *name; 2005 off_t size; 2006 time_t start; 2007{ 2008 char buf[2048]; 2009 char path[MAXPATHLEN]; 2010 char vremotehost[MAXHOSTNAMELEN*4], vpath[MAXPATHLEN*4]; 2011 char *vname, *vpw; 2012 time_t now; 2013 2014 if ((statfd >= 0) && (getcwd(path, sizeof(path)) != NULL)) { 2015 time(&now); 2016 2017 vname = (char *)malloc(strlen(name)*4+1); 2018 if (vname == NULL) 2019 return; 2020 vpw = (char *)malloc(strlen((guest) ? guestpw : pw->pw_name)*4+1); 2021 if (vpw == NULL) { 2022 free(vname); 2023 return; 2024 } 2025 2026 strvis(vremotehost, remotehost, VIS_SAFE|VIS_NOSLASH); 2027 strvis(vpath, path, VIS_SAFE|VIS_NOSLASH); 2028 strvis(vname, name, VIS_SAFE|VIS_NOSLASH); 2029 strvis(vpw, (guest) ? guestpw : pw->pw_name, VIS_SAFE|VIS_NOSLASH); 2030 2031 snprintf(buf, sizeof(buf), 2032 "%.24s %d %s %qd %s/%s %c %s %c %c %s ftp %d %s %s\n", 2033 ctime(&now), now - start + (now == start), 2034 vremotehost, size, vpath, vname, 2035 ((type == TYPE_A) ? 'a' : 'b'), "*" /* none yet */, 2036 'o', ((guest) ? 'a' : 'r'), 2037 vpw, 0 /* none yet */, 2038 ((guest) ? "*" : pw->pw_name), dhostname); 2039 write(statfd, buf, strlen(buf)); 2040 free(vname); 2041 free(vpw); 2042 } 2043} 2044